UGSI Chemical Feed Encore MB, Operation & Maintenance Manual

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3. Function
Motor-driven diaphragm dosing pumps of the Encore
®
series are used in industry in the process engineering sector, and in water treatment and wastewater processing.
The Encore
®
ME and Encore
®
MB are available in two overall sizes:
• Size 1: max 160 l/h delivery capacity
• Size 2: max 380 l/h delivery capacity
Encore
®
ME
The Encore
®
ME is used where no control is required for constant dosing. In this case, the power supply is connected directly to the motor terminal box. To adapt the dosing capacity,
either the stroke length can be adjusted manually from 0 to 100%, or the motor speed can be controlled by means of a separate frequency converter. The Encore
®
ME is optionally
available with electric remote adjustment of the stroke length (ATE).
The Encore
®
ME can be operated in Zone 1 hazardous areas if the corresponding drive is taken into consideration. Further information can be found in section 12.
Encore
®
MB
The "smart" Encore
®
MB is used where the dosing pump is to be integrated in controls or control circuits. The Encore
®
MB allows adaptation to a large variety of different control
signals and system monitoring equipment. The signals required for external activation of the dosing pump can be from simple potential-free closing contacts of water meters or con-
trollers, or analogue 0/4...20 mA signals. For contact actuation (pulse control), the stroke frequency can be adapted by division or multiplication. For internal operation (own stroke),
the dosing pump can be adjusted continuously between 0 and max. 142 strokes/min, depending on version.
Principle of operation
a
Diaphragm
b
Diaphragm rod
c
Return spring for suction stroke
d
Tappet plate
e
Drive eccentric
f
Stroke limit eccentric
Like the roller bearings, the worm gear set of the single-speed gear runs in an oil bath. Dosing takes place when movement
of the drive eccentric
e
causes movement of the diaphragm rod
b
. The suction stroke is produced by the return move-
ment due to spring force. Stroke length is adjusted by limiting the tappet return movement using a manually adjustable
eccentric disc as the end stop (stroke limiting eccentric
f
). The adjustment range is from 0 to 100%.
a b c d
e
f
min.
max.
max.
10
Diaphragm Dosing Pump
Encore
®
MB/ME
Operating Instructions
CF.450.410.001.IM.1114